Makefile需要将ARDUINO_PATH改到自己的arduino路径，新版的好像都没有mksketch，我用的proteus自带的编译。 5.在buzzer目录下cmd指令node main运行js文件，js会先mp3转码成pcm输出到sound目录， 在经过串口输出到arduino。（js里面的串口号也要改成自己的，波特率不要改） ...

It is tiny (~ 1.2 cm), available in voltage ratings from 3.3V to 12V (5V is most common), and can produce frequencies from about ... If we look at lines 10 to 98 - those are the defined notes with ...